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The Single UNIX &reg; Specification, Version 2<br>
Copyright &copy; 1997 The Open Group

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<h4><a name = "tag_000_009_507">&nbsp;</a>NAME</h4><blockquote>
tcsetpgrp - set the foreground process group ID
</blockquote><h4><a name = "tag_000_009_508">&nbsp;</a>SYNOPSIS</h4><blockquote>
<pre><code>

#include &lt;<a href="systypes.h.html">sys/types.h</a>&gt;
#include &lt;<a href="unistd.h.html">unistd.h</a>&gt;

int tcsetpgrp(int <i>fildes</i>, pid_t <i>pgid_id</i>);
</code>
</pre>
</blockquote><h4><a name = "tag_000_009_509">&nbsp;</a>DESCRIPTION</h4><blockquote>
If the process has a controlling terminal,
<i>tcsetpgrp()</i>
will set the foreground process group ID associated with the terminal to
<i>pgid_id</i>.
The file associated with
<i>fildes</i>
must be the controlling terminal of the calling process and the
controlling terminal must be currently associated with the
session of the calling process.
The value of
<i>pgid_id</i>
must match a process group ID of a process in the same session as
the calling process.
<p>
Attempts to use 
<i>tcsetpgrp()</i> 
from a process which is a member of a
background process group on a fildes associated with its controlling
terminal will cause the process group to be sent a SIGTTOU signal.
If the calling process is blocking or ignoring SIGTTOU signals, the
process is allowed to perform the operation, and no signal is sent.
</blockquote><h4><a name = "tag_000_009_510">&nbsp;</a>RETURN VALUE</h4><blockquote>
Upon successful completion, 0 is returned. Otherwise, -1 is returned and
<i>errno</i>
is set to indicate the error.
</blockquote><h4><a name = "tag_000_009_511">&nbsp;</a>ERRORS</h4><blockquote>
The
<i>tcsetpgrp()</i>
function will fail if:
<dl compact>

<dt>[EBADF]<dd>
The
<i>fildes</i>
argument is not a valid file descriptor.

<dt>[EINVAL]<dd>
This implementation does not support the value in the
<i>pgid_id</i>
argument.

<dt>[ENOTTY]<dd>
The calling process does not have a controlling terminal,
or the file is not the controlling terminal, or the controlling
terminal is no longer associated with the session of the
calling process.

<dt>[EPERM]<dd>
The value of
<i>pgid_id</i>
does not match the process group ID of a process
in the same session as the calling process.

</dl>
</blockquote><h4><a name = "tag_000_009_512">&nbsp;</a>EXAMPLES</h4><blockquote>
None.
</blockquote><h4><a name = "tag_000_009_513">&nbsp;</a>APPLICATION USAGE</h4><blockquote>
None.
</blockquote><h4><a name = "tag_000_009_514">&nbsp;</a>FUTURE DIRECTIONS</h4><blockquote>
None.
</blockquote><h4><a name = "tag_000_009_515">&nbsp;</a>SEE ALSO</h4><blockquote>
<i><a href="tcgetpgrp.html">tcgetpgrp()</a></i>,
<i><a href="systypes.h.html">&lt;sys/types.h&gt;</a></i>,
<i><a href="unistd.h.html">&lt;unistd.h&gt;</a></i>.
</blockquote><h4>DERIVATION</h4><blockquote>
Derived from the POSIX.1-1988 standard.
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UNIX &reg; is a registered Trademark of The Open Group.<br>
Copyright &copy; 1997 The Open Group
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